Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7c4c0c95c0c628b99764469f5c9ff881eaa3fbaec3e8ef5b48f223d5f2537e' 
  AND token = 'fu9VQS+2DXQYvb8+o5zvpXGLcyz7E0UFJ4NQqY0HJKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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