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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13511c0d72f817a644b27fdf1d27838cbd454ab4bd9e36860544bbf9c44c5ea7' 
  AND token = 'lNJ0bT8wlHA1C2MIBtbgdTPljk2Kz1m2W7Ste3YAKtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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