SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b10d32638a6fba48b73e7adf692911e6d3a42bc184f20365d206ca1243d305' 
  AND token = 'CTxQy1btFpZW7B/AwV5y1vpNegUGI+86z4HMH7oKyvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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