SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '200e4be892d29e8b6b449c2d85a2a408958dc6831567fd6550f4239c072148a6' 
  AND token = 'XCQ/C68kzTGdwYIvvEZQ7WLXl3SzLAW5DzKNVC8/RZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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