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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5e0b4a14742dad9c210d5d817b03d0fade974559c9035c5c0afccd68a11749' 
  AND token = 'qUltAf4DQTqY7gaje3HEWaXIcVYQ3VQxmL/7GYqXc6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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