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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c506d32b98cac63679184d3837e5454a037a87e029eecb08a0306034788bf6' 
  AND token = '5sEA2PO/SAQx5fmY9FffaVWGxVINdFoiCWRkvKIO7Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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