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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28eb935a1d5ad73b3524f5e3115f8b49d7e2625b2463ee6fa7a83efa7bf77b80' 
  AND token = 'Hwz5B0sshSpECojuJ+dNQlc3HOKmWiQmz0U14oDJBT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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