Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e75625e0035939c0e602b71dd0ec2231e0f1f10eeefb70b58fbeda15e4865fd' 
  AND token = 'SynM0VpuTPeIf+IJ9DusVmOiXBvdWXks/1VKN5kMnKo=' 
  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"
    }
  }
}