Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd78f1e5bb4e461713ef82b327d2be08bfadb6bada4fd9c961d31551774c320c3' 
  AND token = '584TK3mf4vLokzpnk2axlQqaNrVM0ueAqwJX3oZ3+Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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