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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e0124ca4ac429fd9d498d35d61c075b298c4b331e1c2944245704053075965' 
  AND token = '/0/145isvPq7mygU9p8HqcwMp/d8SRnZRKN1PqZ0eiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}