Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f6010c593c346b2a0062972cfdb195d50ea5ef1f28b5a5fab7c2645d1bd7be' 
  AND token = 'JdiqO+j8aIbvssFXWwz3CtK9fkY6QSZ64lHIaxDTVeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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