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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae11f143b6ea9c9b2f9c5b385a4024ec2c5817a0a32d46ff599482211a13239' 
  AND token = 'a33mBHrbGNHfMQS1XHSQnM9+ytMQ3Sa0iIOmzJ5VQ6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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