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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c69a73673ebfb29d03783189701d7b8ead8c989597c3aae68ef80491c881de' 
  AND token = 'f4UnA20ZTuPeHidNba3gME0ryEleEQQKaBRAOfsC5KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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