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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd701ee1479136902e047d5c11913a87b02d9d01f4a5ae4cac161f250daca0112' 
  AND token = 'aG/lMQKlzF5szCJFKVAOJHOR1HaA3oBEqgF0Ohw8m2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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