SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d63efdbcf915a81a075f2204834e5a867d379b5c058f0c10949144c35cc0826' 
  AND token = 'VD/X0zSXvV/EO49dFQ+dHZ+OYqQ9/t1Bslu9O7Q0gq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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