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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e0099ef3193f594ac7cfabc304f581cbbe652186e64f4f6924e967775c4ebc' 
  AND token = 'LVO+ghUU6IOMrmf4CH+X+7x5DZZiWrXfhiWaofWPUAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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