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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71df17b3d598e0f11b117ff6e764b1b494f8eb0332e2cef1346b9fc2dfd77710' 
  AND token = 'tiIkfV9uqx4a81QF9VrT+B5EKACXi0ime6IsCWNX2w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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