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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3114f67b5332167e7fc04bcc868eb5f222f868703bccdb48ad200e1a6b250b47' 
  AND token = 'SpqQhQViAOAw7O+xfOs367+so9Yan7Bmrjk8CpzKEfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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