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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd162e273f310eb22ed8c8eaa3ae4265d77c7b897a878b7696195459232ad35c0' 
  AND token = 'QPc45yV+yz7APO+vPTEhY+wHtBL527YtWMsglAEWfXw=' 
  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"
    }
  }
}