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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9de8be9008e14cc5d143f1fd99279a0a46a994d74f3ecc52a07e4dd41f1321' 
  AND token = 'VI8mH9dgyY5VJXNxnXI9kI5VCuUc6geP90pseUCQ5No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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