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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dedcb80db000f64ad609a42cab8636a710cb07e235b27f0c112e25242cd8579' 
  AND token = 'L7SGUYlI9Zb+VTXnDehz3klbUggl8PAbWKLXHMi2kRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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