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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7113a2d96bf422293585b17054180f6094c764fce640a20b39cde173cd61a7' 
  AND token = 'cUW3xPKMkbmh4oxBc2Xshr1Hql+y+Wn+0hoezDg3J+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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