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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb3b7de1705713b6463736153f0285d6b70910e5b9f2b5f686fc5bb24708ef4' 
  AND token = '+7KB2K9SOoFprbOTpfkZbgiYFP+c3liQmAUmiwv87wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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