Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb6cc09286e262ac8a163ee63df86a185eacbb230297194566cc045705c0b77a' 
  AND token = 'HZjjwaOpw0RQlvkhiWxdfy8HZoS3weEZn7aFSYFSbBY=' 
  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"
    }
  }
}