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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9afee9d49ecec22d2ac72e5791de7ef4ab2ccf8a5e9c7c931b121e1d56769c8d' 
  AND token = '1dofLbF5/oZaLLGnowsvztQ66O0N9O4rEoDqIkdX/I0=' 
  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"
    }
  }
}