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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84ca8d1d9f2fd6c503aecc00be4491f8bb22cf85c3cf1bea0e48f4f66739820' 
  AND token = 'tILuCPD/i3vSOM3jBZEOAhr7koBfndViJGkntsUd+a4=' 
  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"
    }
  }
}