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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6bdf4668a3beba6156f07a25e3b2c6e8a9b9436805c16b899533240a01c76fa' 
  AND token = 'pL2ofoXOQy9K+QUPVultPW9/3PQVfLw1Pp6MGTnt85I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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