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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d4f203a52bee1e6867ef99c76caa4be1fea4ad3e5938eac47b28bd46db90353' 
  AND token = 'XeSUKUUKFHbFVxbr16jzYovAJlxPJLV1Eyzvu0XSeNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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