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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad4d40767027a6f1a2e4013e2fe41842e2cfbf344ff27d4af182322a57f3e9b' 
  AND token = 'EIYSHlFd2pzE4D3nqNlTtfSZikI/CfcxQr1RiXoB3So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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