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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd3034b12d5842bc2445b6909545afc9e90e98590d28243689286f08c30e02f' 
  AND token = 'YkOa0Hjz0aqUbhDU6yQPMjAkXXZGz/EzDGoROeA1v1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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