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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c95d7cc3985a6d398ba017bf542ea3f6d27c6c5f00a06caadfa7582aab87c05' 
  AND token = '2kr8aogN+1EhD8eHVffKDo61H+9/7P6UIHYn4sH/svs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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