SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f148aaff8498696f39d227f57c6d0b47664fc623aba4a539c0303e8f0e25ec' 
  AND token = 'JL8XZGR1vG0AtAkPBmLzSAZg+hVA/1d8lEEN7rP149I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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