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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f541bfa38f9629b472d8aa1c38df030fe8845c104d3934ece63e5ba2538fb14b' 
  AND token = 'TwMUEWr7DvHVrIciQiRwwBHRed1EmqGgyeThEKJ97gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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