Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7cf6b13f5843e7931d3e64c44ddb1da50e8e078b44a168e0a59c3f5ad8e78aa' 
  AND token = 'wa/7Z85phVYC+s+PmbgbXSsyc1ccmJLVOeSSkxDfqCE=' 
  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"
    }
  }
}