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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13f568cbe65e12b52617dea79e90ce321fa375185c5cb8c28e88cb21be2aefb' 
  AND token = '/t/7yEhvSSOLD1BffVO3JBJBZgidkuDc/uqeL6KTWJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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