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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a8a28d4bf4ebad7ca18ab40063fbee881663d12cf2f5a2b8e61343932c40b1' 
  AND token = '6uc7rpnWSUWZ1LQyUX5YfccX6qgOeoii5BpkNA/m8AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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