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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50bd7fe3ef1f3994e9bff285f8bab628937fdcfd2b7c67291d84350ddb9aed1e' 
  AND token = 'suu4T+JkCfmJUiUok5BOF3P8DqpTAE7sY4HFNEJu8N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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