Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb313c75e4246d85c7ae50ee61c95a5b4ce4712b79a64b183471e48a62cf278e' 
  AND token = 'cOJ/eBVpoOVnKM0maeAdlFNCkgE4dJZDPf6aYGBkktU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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