SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eccc2bd97bdf5cd2d90674a46a28414e512dde1932e9fb1a647de9425b48a42b' 
  AND token = 'osCcgiYKqGldjGr/mavfBGK5TjXNLVjFM4VVX8tI8PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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