SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf1d36ff4d5cd4562e00a106fcabfa8485e30ca298243fe5cb83b519de2676b' 
  AND token = 'fB6VyY4Iq8B9WGTwRj2F9wx744n2byhLPz+ijrIIWig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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