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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d9ade80233404126f46d83e5f2e67f2fb4517485c3c6e8cec5dcfc77d0e01d9' 
  AND token = 'LV84qDUKrdAExM7GxKR4/F5wuTRAbr29LZ1laO3wwk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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