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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bbc3b5d5c09ef4f44b7262cd1d8ae5ebeb82efda410ffc7053a917e5ca7c448' 
  AND token = 'UNAf++x+v46ka5UEYkLHW/sPv/bqjwDJWaEKwZDzO+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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