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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1be83f61717786fc2ea34157829a1fc0bbc917a9745113295829902cc02360b' 
  AND token = 'epB264nmlgwOm7URIf6BuxGSZ4Ms3b4WVQ/5Uh/AQ0M=' 
  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"
    }
  }
}