Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '495c9efe4d9ea0abacb6f8f01586048892197b707d7e132d6e596f529d0f27be' 
  AND token = 'YqaZJKdh0ean7CGZ+hRRDTR4Gb83XH3sxi94VDsSgfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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