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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3edf988f0d79831ee48e0e4d4223b32ce43f5d12041e9432b224824049cf29de' 
  AND token = 'RZTeWfB5LnAWpXdT7YkeMeVaz4QJ67B11Ri0yXaJq1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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