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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ca4569fddfe092b4b6ec5d12dbc07359b681a60e08529ca552108386cea973' 
  AND token = 'N/7BKoqGUD9nT9hc73ul621UTJXdrJid1nJ4p/+5jfQ=' 
  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"
    }
  }
}